kvm: mmu: fix is_tdp_mmu_check when the TDP MMU is not in use

[linux-2.6-microblaze.git] / arch / x86 / kvm / mmu / tdp_mmu.c

diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c
index 27e381c..ff28a5c 100644 (file)
--- a/arch/x86/kvm/mmu/tdp_mmu.c
+++ b/arch/x86/kvm/mmu/tdp_mmu.c
@@ -49,7 +49,14 @@ bool is_tdp_mmu_root(struct kvm *kvm, hpa_t hpa)
 {
        struct kvm_mmu_page *sp;
 
+       if (!kvm->arch.tdp_mmu_enabled)
+               return false;
+       if (WARN_ON(!VALID_PAGE(hpa)))
+               return false;
+
        sp = to_shadow_page(hpa);
+       if (WARN_ON(!sp))
+               return false;
 
        return sp->tdp_mmu_page && sp->root_count;
 }